arch/riscv/mm/init.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Regents of the University of California
   4  * Copyright (C) 2019 Western Digital Corporation or its affiliates.
   5  */
   6
   7 #include <linux/init.h>
   8 #include <linux/mm.h>
   9 #include <linux/memblock.h>
  10 #include <linux/initrd.h>
  11 #include <linux/swap.h>
  12 #include <linux/sizes.h>
  13 #include <linux/of_fdt.h>
  14 #include <linux/libfdt.h>
  15 #include <linux/set_memory.h>
  16 #include <linux/dma-map-ops.h>
  17
  18 #include <asm/fixmap.h>
  19 #include <asm/tlbflush.h>
  20 #include <asm/sections.h>
  21 #include <asm/soc.h>
  22 #include <asm/io.h>
  23 #include <asm/ptdump.h>
  24 #include <asm/numa.h>
  25
  26 #include "../kernel/head.h"
  27
  28 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
  29                                                         __page_aligned_bss;
  30 EXPORT_SYMBOL(empty_zero_page);
  31
  32 extern char _start[];
  33 #define DTB_EARLY_BASE_VA      PGDIR_SIZE
  34 void *dtb_early_va __initdata;
  35 uintptr_t dtb_early_pa __initdata;
  36
  37 struct pt_alloc_ops {
  38         pte_t *(*get_pte_virt)(phys_addr_t pa);
  39         phys_addr_t (*alloc_pte)(uintptr_t va);
  40 #ifndef __PAGETABLE_PMD_FOLDED
  41         pmd_t *(*get_pmd_virt)(phys_addr_t pa);
  42         phys_addr_t (*alloc_pmd)(uintptr_t va);
  43 #endif
  44 };
  45
  46 static phys_addr_t dma32_phys_limit __ro_after_init;
  47
  48 static void __init zone_sizes_init(void)
  49 {
  50         unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
  51
  52 #ifdef CONFIG_ZONE_DMA32
  53         max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
  54 #endif
  55         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
  56
  57         free_area_init(max_zone_pfns);
  58 }
  59
  60 static void setup_zero_page(void)
  61 {
  62         memset((void *)empty_zero_page, 0, PAGE_SIZE);
  63 }
  64
  65 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
  66 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
  67 {
  68         pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld kB)\n", name, b, t,
  69                   (((t) - (b)) >> 10));
  70 }
  71
  72 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
  73 {
  74         pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld MB)\n", name, b, t,
  75                   (((t) - (b)) >> 20));
  76 }
  77
  78 static void print_vm_layout(void)
  79 {
  80         pr_notice("Virtual kernel memory layout:\n");
  81         print_mlk("fixmap", (unsigned long)FIXADDR_START,
  82                   (unsigned long)FIXADDR_TOP);
  83         print_mlm("pci io", (unsigned long)PCI_IO_START,
  84                   (unsigned long)PCI_IO_END);
  85         print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
  86                   (unsigned long)VMEMMAP_END);
  87         print_mlm("vmalloc", (unsigned long)VMALLOC_START,
  88                   (unsigned long)VMALLOC_END);
  89         print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
  90                   (unsigned long)high_memory);
  91 }
  92 #else
  93 static void print_vm_layout(void) { }
  94 #endif /* CONFIG_DEBUG_VM */
  95
  96 void __init mem_init(void)
  97 {
  98 #ifdef CONFIG_FLATMEM
  99         BUG_ON(!mem_map);
 100 #endif /* CONFIG_FLATMEM */
 101
 102         high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
 103         memblock_free_all();
 104
 105         mem_init_print_info(NULL);
 106         print_vm_layout();
 107 }
 108
 109 void __init setup_bootmem(void)
 110 {
 111         phys_addr_t mem_start = 0;
 112         phys_addr_t start, dram_end, end = 0;
 113         phys_addr_t vmlinux_end = __pa_symbol(&_end);
 114         phys_addr_t vmlinux_start = __pa_symbol(&_start);
 115         phys_addr_t max_mapped_addr = __pa(~(ulong)0);
 116         u64 i;
 117
 118         /* Find the memory region containing the kernel */
 119         for_each_mem_range(i, &start, &end) {
 120                 phys_addr_t size = end - start;
 121                 if (!mem_start)
 122                         mem_start = start;
 123                 if (start <= vmlinux_start && vmlinux_end <= end)
 124                         BUG_ON(size == 0);
 125         }
 126
 127         /*
 128          * The maximal physical memory size is -PAGE_OFFSET.
 129          * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed
 130          * as it is unusable by kernel.
 131          */
 132         memblock_enforce_memory_limit(-PAGE_OFFSET);
 133
 134         /* Reserve from the start of the kernel to the end of the kernel */
 135         memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
 136
 137         dram_end = memblock_end_of_DRAM();
 138
 139         /*
 140          * memblock allocator is not aware of the fact that last 4K bytes of
 141          * the addressable memory can not be mapped because of IS_ERR_VALUE
 142          * macro. Make sure that last 4k bytes are not usable by memblock
 143          * if end of dram is equal to maximum addressable memory.
 144          */
 145         if (max_mapped_addr == (dram_end - 1))
 146                 memblock_set_current_limit(max_mapped_addr - 4096);
 147
 148         max_pfn = PFN_DOWN(dram_end);
 149         max_low_pfn = max_pfn;
 150         dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
 151         set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
 152
 153         reserve_initrd_mem();
 154         /*
 155          * If DTB is built in, no need to reserve its memblock.
 156          * Otherwise, do reserve it but avoid using
 157          * early_init_fdt_reserve_self() since __pa() does
 158          * not work for DTB pointers that are fixmap addresses
 159          */
 160         if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
 161                 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
 162
 163         early_init_fdt_scan_reserved_mem();
 164         dma_contiguous_reserve(dma32_phys_limit);
 165         memblock_allow_resize();
 166 }
 167
 168 #ifdef CONFIG_MMU
 169 static struct pt_alloc_ops pt_ops;
 170
 171 unsigned long va_pa_offset;
 172 EXPORT_SYMBOL(va_pa_offset);
 173 unsigned long pfn_base;
 174 EXPORT_SYMBOL(pfn_base);
 175
 176 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 177 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 178 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
 179
 180 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
 181
 182 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
 183 {
 184         unsigned long addr = __fix_to_virt(idx);
 185         pte_t *ptep;
 186
 187         BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
 188
 189         ptep = &fixmap_pte[pte_index(addr)];
 190
 191         if (pgprot_val(prot))
 192                 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
 193         else
 194                 pte_clear(&init_mm, addr, ptep);
 195         local_flush_tlb_page(addr);
 196 }
 197
 198 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
 199 {
 200         return (pte_t *)((uintptr_t)pa);
 201 }
 202
 203 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
 204 {
 205         clear_fixmap(FIX_PTE);
 206         return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
 207 }
 208
 209 static inline pte_t *get_pte_virt_late(phys_addr_t pa)
 210 {
 211         return (pte_t *) __va(pa);
 212 }
 213
 214 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
 215 {
 216         /*
 217          * We only create PMD or PGD early mappings so we
 218          * should never reach here with MMU disabled.
 219          */
 220         BUG();
 221 }
 222
 223 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
 224 {
 225         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 226 }
 227
 228 static phys_addr_t alloc_pte_late(uintptr_t va)
 229 {
 230         unsigned long vaddr;
 231
 232         vaddr = __get_free_page(GFP_KERNEL);
 233         if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)))
 234                 BUG();
 235         return __pa(vaddr);
 236 }
 237
 238 static void __init create_pte_mapping(pte_t *ptep,
 239                                       uintptr_t va, phys_addr_t pa,
 240                                       phys_addr_t sz, pgprot_t prot)
 241 {
 242         uintptr_t pte_idx = pte_index(va);
 243
 244         BUG_ON(sz != PAGE_SIZE);
 245
 246         if (pte_none(ptep[pte_idx]))
 247                 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
 248 }
 249
 250 #ifndef __PAGETABLE_PMD_FOLDED
 251
 252 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
 253 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
 254 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 255 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 256
 257 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
 258 {
 259         /* Before MMU is enabled */
 260         return (pmd_t *)((uintptr_t)pa);
 261 }
 262
 263 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
 264 {
 265         clear_fixmap(FIX_PMD);
 266         return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
 267 }
 268
 269 static pmd_t *get_pmd_virt_late(phys_addr_t pa)
 270 {
 271         return (pmd_t *) __va(pa);
 272 }
 273
 274 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
 275 {
 276         BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT);
 277
 278         return (uintptr_t)early_pmd;
 279 }
 280
 281 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
 282 {
 283         return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 284 }
 285
 286 static phys_addr_t alloc_pmd_late(uintptr_t va)
 287 {
 288         unsigned long vaddr;
 289
 290         vaddr = __get_free_page(GFP_KERNEL);
 291         BUG_ON(!vaddr);
 292         return __pa(vaddr);
 293 }
 294
 295 static void __init create_pmd_mapping(pmd_t *pmdp,
 296                                       uintptr_t va, phys_addr_t pa,
 297                                       phys_addr_t sz, pgprot_t prot)
 298 {
 299         pte_t *ptep;
 300         phys_addr_t pte_phys;
 301         uintptr_t pmd_idx = pmd_index(va);
 302
 303         if (sz == PMD_SIZE) {
 304                 if (pmd_none(pmdp[pmd_idx]))
 305                         pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
 306                 return;
 307         }
 308
 309         if (pmd_none(pmdp[pmd_idx])) {
 310                 pte_phys = pt_ops.alloc_pte(va);
 311                 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
 312                 ptep = pt_ops.get_pte_virt(pte_phys);
 313                 memset(ptep, 0, PAGE_SIZE);
 314         } else {
 315                 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
 316                 ptep = pt_ops.get_pte_virt(pte_phys);
 317         }
 318
 319         create_pte_mapping(ptep, va, pa, sz, prot);
 320 }
 321
 322 #define pgd_next_t              pmd_t
 323 #define alloc_pgd_next(__va)    pt_ops.alloc_pmd(__va)
 324 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
 325 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 326         create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
 327 #define fixmap_pgd_next         fixmap_pmd
 328 #else
 329 #define pgd_next_t              pte_t
 330 #define alloc_pgd_next(__va)    pt_ops.alloc_pte(__va)
 331 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
 332 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)      \
 333         create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
 334 #define fixmap_pgd_next         fixmap_pte
 335 #endif
 336
 337 void __init create_pgd_mapping(pgd_t *pgdp,
 338                                       uintptr_t va, phys_addr_t pa,
 339                                       phys_addr_t sz, pgprot_t prot)
 340 {
 341         pgd_next_t *nextp;
 342         phys_addr_t next_phys;
 343         uintptr_t pgd_idx = pgd_index(va);
 344
 345         if (sz == PGDIR_SIZE) {
 346                 if (pgd_val(pgdp[pgd_idx]) == 0)
 347                         pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
 348                 return;
 349         }
 350
 351         if (pgd_val(pgdp[pgd_idx]) == 0) {
 352                 next_phys = alloc_pgd_next(va);
 353                 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
 354                 nextp = get_pgd_next_virt(next_phys);
 355                 memset(nextp, 0, PAGE_SIZE);
 356         } else {
 357                 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
 358                 nextp = get_pgd_next_virt(next_phys);
 359         }
 360
 361         create_pgd_next_mapping(nextp, va, pa, sz, prot);
 362 }
 363
 364 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
 365 {
 366         /* Upgrade to PMD_SIZE mappings whenever possible */
 367         if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
 368                 return PAGE_SIZE;
 369
 370         return PMD_SIZE;
 371 }
 372
 373 /*
 374  * setup_vm() is called from head.S with MMU-off.
 375  *
 376  * Following requirements should be honoured for setup_vm() to work
 377  * correctly:
 378  * 1) It should use PC-relative addressing for accessing kernel symbols.
 379  *    To achieve this we always use GCC cmodel=medany.
 380  * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
 381  *    so disable compiler instrumentation when FTRACE is enabled.
 382  *
 383  * Currently, the above requirements are honoured by using custom CFLAGS
 384  * for init.o in mm/Makefile.
 385  */
 386
 387 #ifndef __riscv_cmodel_medany
 388 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
 389 #endif
 390
 391 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 392 {
 393         uintptr_t va, pa, end_va;
 394         uintptr_t load_pa = (uintptr_t)(&_start);
 395         uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
 396         uintptr_t map_size;
 397 #ifndef __PAGETABLE_PMD_FOLDED
 398         pmd_t fix_bmap_spmd, fix_bmap_epmd;
 399 #endif
 400
 401         va_pa_offset = PAGE_OFFSET - load_pa;
 402         pfn_base = PFN_DOWN(load_pa);
 403
 404         /*
 405          * Enforce boot alignment requirements of RV32 and
 406          * RV64 by only allowing PMD or PGD mappings.
 407          */
 408         map_size = PMD_SIZE;
 409
 410         /* Sanity check alignment and size */
 411         BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
 412         BUG_ON((load_pa % map_size) != 0);
 413
 414         pt_ops.alloc_pte = alloc_pte_early;
 415         pt_ops.get_pte_virt = get_pte_virt_early;
 416 #ifndef __PAGETABLE_PMD_FOLDED
 417         pt_ops.alloc_pmd = alloc_pmd_early;
 418         pt_ops.get_pmd_virt = get_pmd_virt_early;
 419 #endif
 420         /* Setup early PGD for fixmap */
 421         create_pgd_mapping(early_pg_dir, FIXADDR_START,
 422                            (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
 423
 424 #ifndef __PAGETABLE_PMD_FOLDED
 425         /* Setup fixmap PMD */
 426         create_pmd_mapping(fixmap_pmd, FIXADDR_START,
 427                            (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
 428         /* Setup trampoline PGD and PMD */
 429         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 430                            (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
 431         create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
 432                            load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
 433 #else
 434         /* Setup trampoline PGD */
 435         create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
 436                            load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
 437 #endif
 438
 439         /*
 440          * Setup early PGD covering entire kernel which will allows
 441          * us to reach paging_init(). We map all memory banks later
 442          * in setup_vm_final() below.
 443          */
 444         end_va = PAGE_OFFSET + load_sz;
 445         for (va = PAGE_OFFSET; va < end_va; va += map_size)
 446                 create_pgd_mapping(early_pg_dir, va,
 447                                    load_pa + (va - PAGE_OFFSET),
 448                                    map_size, PAGE_KERNEL_EXEC);
 449
 450 #ifndef __PAGETABLE_PMD_FOLDED
 451         /* Setup early PMD for DTB */
 452         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 453                            (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
 454 #ifndef CONFIG_BUILTIN_DTB
 455         /* Create two consecutive PMD mappings for FDT early scan */
 456         pa = dtb_pa & ~(PMD_SIZE - 1);
 457         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
 458                            pa, PMD_SIZE, PAGE_KERNEL);
 459         create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
 460                            pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
 461         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
 462 #else /* CONFIG_BUILTIN_DTB */
 463         dtb_early_va = __va(dtb_pa);
 464 #endif /* CONFIG_BUILTIN_DTB */
 465 #else
 466 #ifndef CONFIG_BUILTIN_DTB
 467         /* Create two consecutive PGD mappings for FDT early scan */
 468         pa = dtb_pa & ~(PGDIR_SIZE - 1);
 469         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
 470                            pa, PGDIR_SIZE, PAGE_KERNEL);
 471         create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
 472                            pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
 473         dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
 474 #else /* CONFIG_BUILTIN_DTB */
 475         dtb_early_va = __va(dtb_pa);
 476 #endif /* CONFIG_BUILTIN_DTB */
 477 #endif
 478         dtb_early_pa = dtb_pa;
 479
 480         /*
 481          * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
 482          * range can not span multiple pmds.
 483          */
 484         BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
 485                      != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
 486
 487 #ifndef __PAGETABLE_PMD_FOLDED
 488         /*
 489          * Early ioremap fixmap is already created as it lies within first 2MB
 490          * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
 491          * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
 492          * the user if not.
 493          */
 494         fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
 495         fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
 496         if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
 497                 WARN_ON(1);
 498                 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
 499                         pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
 500                 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
 501                         fix_to_virt(FIX_BTMAP_BEGIN));
 502                 pr_warn("fix_to_virt(FIX_BTMAP_END):   %08lx\n",
 503                         fix_to_virt(FIX_BTMAP_END));
 504
 505                 pr_warn("FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
 506                 pr_warn("FIX_BTMAP_BEGIN:     %d\n", FIX_BTMAP_BEGIN);
 507         }
 508 #endif
 509 }
 510
 511 static void __init setup_vm_final(void)
 512 {
 513         uintptr_t va, map_size;
 514         phys_addr_t pa, start, end;
 515         u64 i;
 516
 517         /**
 518          * MMU is enabled at this point. But page table setup is not complete yet.
 519          * fixmap page table alloc functions should be used at this point
 520          */
 521         pt_ops.alloc_pte = alloc_pte_fixmap;
 522         pt_ops.get_pte_virt = get_pte_virt_fixmap;
 523 #ifndef __PAGETABLE_PMD_FOLDED
 524         pt_ops.alloc_pmd = alloc_pmd_fixmap;
 525         pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
 526 #endif
 527         /* Setup swapper PGD for fixmap */
 528         create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
 529                            __pa_symbol(fixmap_pgd_next),
 530                            PGDIR_SIZE, PAGE_TABLE);
 531
 532         /* Map all memory banks */
 533         for_each_mem_range(i, &start, &end) {
 534                 if (start >= end)
 535                         break;
 536                 if (start <= __pa(PAGE_OFFSET) &&
 537                     __pa(PAGE_OFFSET) < end)
 538                         start = __pa(PAGE_OFFSET);
 539
 540                 map_size = best_map_size(start, end - start);
 541                 for (pa = start; pa < end; pa += map_size) {
 542                         va = (uintptr_t)__va(pa);
 543                         create_pgd_mapping(swapper_pg_dir, va, pa,
 544                                            map_size, PAGE_KERNEL_EXEC);
 545                 }
 546         }
 547
 548         /* Clear fixmap PTE and PMD mappings */
 549         clear_fixmap(FIX_PTE);
 550         clear_fixmap(FIX_PMD);
 551
 552         /* Move to swapper page table */
 553         csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
 554         local_flush_tlb_all();
 555
 556         /* generic page allocation functions must be used to setup page table */
 557         pt_ops.alloc_pte = alloc_pte_late;
 558         pt_ops.get_pte_virt = get_pte_virt_late;
 559 #ifndef __PAGETABLE_PMD_FOLDED
 560         pt_ops.alloc_pmd = alloc_pmd_late;
 561         pt_ops.get_pmd_virt = get_pmd_virt_late;
 562 #endif
 563 }
 564 #else
 565 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 566 {
 567         dtb_early_va = (void *)dtb_pa;
 568         dtb_early_pa = dtb_pa;
 569 }
 570
 571 static inline void setup_vm_final(void)
 572 {
 573 }
 574 #endif /* CONFIG_MMU */
 575
 576 #ifdef CONFIG_STRICT_KERNEL_RWX
 577 void protect_kernel_text_data(void)
 578 {
 579         unsigned long text_start = (unsigned long)_start;
 580         unsigned long init_text_start = (unsigned long)__init_text_begin;
 581         unsigned long init_data_start = (unsigned long)__init_data_begin;
 582         unsigned long rodata_start = (unsigned long)__start_rodata;
 583         unsigned long data_start = (unsigned long)_data;
 584         unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
 585
 586         set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT);
 587         set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT);
 588         set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT);
 589         /* rodata section is marked readonly in mark_rodata_ro */
 590         set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 591         set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
 592 }
 593
 594 void mark_rodata_ro(void)
 595 {
 596         unsigned long rodata_start = (unsigned long)__start_rodata;
 597         unsigned long data_start = (unsigned long)_data;
 598
 599         set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
 600
 601         debug_checkwx();
 602 }
 603 #endif
 604
 605 void __init paging_init(void)
 606 {
 607         setup_vm_final();
 608         setup_zero_page();
 609 }
 610
 611 void __init misc_mem_init(void)
 612 {
 613         arch_numa_init();
 614         sparse_init();
 615         zone_sizes_init();
 616         memblock_dump_all();
 617 }
 618
 619 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 620 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 621                                struct vmem_altmap *altmap)
 622 {
 623         return vmemmap_populate_basepages(start, end, node, NULL);
 624 }
 625 #endif